Page Rank is important. If someone claims that it is not important, the same time he is claiming that backlinks are not important either. But the PR value you see in the toolbar is not important, since it is updated in average every 3 months.
That said, you cannot tell how much PR Google have assigned to your pages internally already.
So just sit back, enjoy your rankings and come back and tell us how green the bar grew at the next Google Toolbar export. I would be interested to hear that.

Good luck,

John

Further reading: http://www.google.com/corporate/tech.html

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